Electromagnetic control device



Jan.l1,1944. mm j 2,338,957

ELECTROMAGNETIC CONTROL DEVICE Filed May 12, 1939 16 I b 76 1 Y r J F 80I 45 10 I MIHIMIIIUJII 4r Patented Jun. 11, 1944 Hans Miinz, Korntal,near Stuttgart, Germany vested in the Alien Property CustodianApplication May 12, 1939 Serial No. 273,332 In Germany May 27, 1938' 2Claims. (Cl. 111-229) 'The invention relates to an electromagneticcontrol device for use with regulators or charging switches, inparticular with combined regulators and switches, for electricalinstallations as used in vehicles, having a current winding, dis- Dosedin the magnetic circuit outside of the magnetic core. I

According to the present invention an auxiliary magnet, having its ownpole core on which the current coil iswound, assists in operating thearmature controlling the contacts or the control device. This auxiliarymagnet may be attached to-the apparatus in a simple manner withoutdisturbing its construction.

The invention is by way of example more particularly described withreference to the accom-' panying drawing in whichure 1 is a verticalview, partly in section, of a combined switch and regulator togetherwith a circuit diagram of an electrical installation as used in powerdriven vehicles, and'Figure 2 is a vertical view of a modifiedconstruction also embodying the principles of the invention.

In both figures the same reference characters are'employed to indicatesimilar parts.

core I, carrying a current coil 8 and disposed on the yoke 01 a U-shapedmagnet frame I. The

voltage coil 4 actuates two right angle shaped armatures I and I, whichare suspended for limited angular movement by springs la, la, disposedon the ends of the limbs la, lb of the magnet frame 1. The verticallimbs of said armatures l and 9 are approximately parallel to the mainpole core I. The armature I is adapted to actuate the contacts I and IIoi the automatic switch, the vertical armature limb lb having attachedexplained. The horizontal armature limb 8:! extends over the end of thecore I in cooperating relation therewith. The armature 9 is adapted toactuate the contacts l2 and I3 oi the voltage regulator, these contactsremaining closed elocept when core is sufiiciently energized by voltagecoil 4.

10 magnet.

The armature l regulates the voltage 01 the dynamo I, 2, in knownmanner, by periodically opening and closing the contacts i2, it. Thearmature 8 controls the output from the dynamo by connecting ordisconnecting anexternal current consuming circuit in known manner.

Through .a slot provided in limb 1a of the magnet frame 1 on which thearmature 8 is mounted, passes the core H of an auxiliary The core I,which is thus disposed transversely to the main core, specifically atright angles thereto, carries a. current coil i5- and is supported by aright angle shaped magnet frame I fixed to the top of said limb la.

As soon as the dynamo produces a s'ufliciently high voltage, thearmature Bis attracted as a result or the excitation of the voltage coil4 and closes the contacts it, ll oi the switch, whereupon electriccurrent from the dynamo flows through the two current coils 6 and I! toa battery H or to current consuming elements It. As to the sense ofmagnetisation, the action or the current coils 8 and il lathe-same as ofthe voltage coil 4. The magnetis'ation oi the core produced. by thecurrent coil -'li'attracts armature limb 8b which-extendsover "the end01' the core in cooperating relation therewith; There are, then, twomagnetic fluxes present. One passes through the magnet core 5, throughthe halt oi the magnet frame 1 assigned to the switch and through thearmature limb 8d. The other passes through the auxiliary magnet core ll,through the magnet frame it and through the armature limb 8b whichextends over the end of the core ll. Consequently this limb comes torest on the end of the core 14 so that in this position, the airgap'disappears and the armature I adheres to the end of the auxiliarycore. The armature 8 thus becomes insensitive to vibration'producedduring driving of the vehicle on which the device is mounted so thatthere is no danger 01' such vibration opening the switch contacts i0, Ii. g I The core i4 01' the auxiliarymagnet acts as an additional polesurface beyon'dthe'main core thereto a spring 8c which carries thecontact Ii,

I to attract the armature 8.

If the voltage generated by thedynamo falls below that of the battery sothat a reverse current flows through the current coil II of theauxiliary magnet ll, Ii, then the armature 8 is released from the core Iand is moved by spring 8a to open the switch contacts III, II. Thisarrangement has the advantage that the switch responds even to a smallreverse current.

The auxiliary magnet removes the possibility of any chance short circuitin the current-consuming circuit opening and closing the switch contactsin rapid sequence, in the event of a strong current, and consequentlydamaging them. The customary use of a bimetallic construction for theswitch contact springs is therefore not necessary in this case. 7

As will be seen from the drawing, the application of the auxiliarymagnets l4, I! to the top of the limb of the magnet frame 1 results in avery compact construction. The approved construction of regulatorswitches with a U-shaped magnet frame is likewise retained.

Referring to Fig. 2, the arrangement differs from that of Fig. 1 in thatthe armatures l and 8 are suspended by springs l9 and disposed onsupports 2| and 22 which are fastened to the limbs 23 and 24 of themagnet frame I and that the core I carrying the current coil I! isdisposed on the inner side of the magnet limb It.

The construction of Fig. 2 is more simple than that of Fig. 1, for thereno separate angle shaped core supp rts are needed because the core H isdisposed directly on the limb 23 of the magnet frame 1. i

The limbs 23, 24 do not as hitherto known extend to the horizontalsupports of the angle shaped armatures, but are shortened. This arrangement has an advantageous effect on the magnetic flux. The magneticleakage is reduced.

The auxiliary magnet makes it possible to pro-- vide the mainelectromagnet in a simple manner with a winding which is not wound onthe main core. Hitherto a winding of this sort was pushed on to the limbof the magnet frame, which was a complicated process from the point ofview of fastening the armature and arranging the contacts.

As the auxiliary core I has a small diameter as compared with the maincore 5 the current coil i5 which is wound on to it requires only a shortwinding.

As shown in the drawing by way of example the main core 5 carries avoltage coil 4 and a current coil 6 for regulation purposes.

The auxiliary magnet l4, I! for the automatic switch may, however, onthe omission of the current coil 6 be applied to regulator switcheswhich have only a voltage coil for regulation.

I declare that what I claim is:

1. An electromagnetic device for controlling the output of a generatorto an external currentconsuming circuit, comprising the combination,with a U-shaped magnet frame, of a main pole core disposed intermediateand substantially parallel to the upright limbs of the frame, anauxiliary pole core carried by one of said limbs and disposedtransversely with respect to the main core, an angularly movablearmature having angularly related limbs which extend over the ends ofthe respective pole cores, windings so arranged on said cores that, whenenergized, both cores tend to move said armature in the sameangular-direction, the winding on said auxiliary core being in serieswith the current-consuming circuit, and switch contacts operable by saidarmature to connect the generator to said circuit, energization of themain core winding serving to move said armature sufficiently to closesaid contacts, whereupon energization of the auxiliary core by flow ofcurrent to the current-consuming circuit causes the cooperating limb ofthe armature to be held against the end of said auxiliary core.

2. An electromagnetic control device as defined in claim 1, wherein themain core also carries a current winding in series with that on saidauxiliary core and arranged to exert its magnetic force in the samesense as said voltage coil.

HANS MUNZ.

